薄膜磁気記録媒体の低ノイズ性と熱安定性

概要

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Topics related to thin-film magnetic recording media with high recording densities of over 10 Gb/in^2 are reviewed from the thermal stability point of view. Such high recording densities represent sub-100-nm bit lengths, which are only a few times more than the crystal grain diameter in the magnetic layers of current media. Scaling arguments indicate that a grain diameter of less than 10 nm is needed to satisfy signal-to-noise requirements. Such small grains will result in the decay of recorded bits owing to thermal fluctuation. Approaches such as increasing the anisotropy field by increasing the Pt content of the magnetic layer, eliminating small grains by inserting an intermediate layer with an hcp structure between the underlayer and magnetic layer, and adding a keeper layer will be effective for improving the thermal stability. An appropriate head-medium system design that takes account of the thermal fluctuation is also required.
社団法人日本磁気学会の論文
1998-12-01